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The global drug companies GlaxoSmithKline and Pfizer are being urged to cut the price of the pneumonia vaccine in poor countries to less than $5 (£3.30; €4.61) a child.

The charity Médecins Sans Frontières has launched a campaign calling on the companies to be transparent about the amount they charge for the vaccine. It said that the lowest price it was aware of was around $10 a dose. The charity also claimed that the firms stop countries disclosing the price they pay for the vaccine.